There's a closed pull request on the void-packages repository

mymcplus: update to 3.0.4
https://github.com/void-linux/void-packages/pull/28382

Description:
<!-- Mark items with [x] where applicable -->

#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

#### Does it build and run successfully? 
(Please choose at least one native build and, if supported, at least one cross build. More are better.)
- [x] I built this PR locally for my native architecture, (x86_64-glibc)

This project moved to sourcehut so I've updated the links. Current version held in void-packages won't run under py3.9
I only tested the CLI portion of this program, I don't think the GUI works, but I think that is because wxPython is borked?

Edit: odd, CI logs seem to complain about the only two deps wxPython and pyOpenGL but I did not see this behavior when building locally